Diona is a good replacement for those who don’t have Qiqi. She lacks DMG potential, but is an overall solid support character.
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Here are some builds I came up for her! These builds are pretty much interchangeably with each other.
Diona’s elemental burst allows her to heal nearby allies over time. The HP regained is based on Diona’s HP and lasts for 12 seconds. This build focus on Diona as a healer and keeping her allies healthy. Due to the high energy cost of her burst, she should be at least C1 for this build. However, a high energy recharge stat will substitute if you don’t have any constellations on her. The primary skill you should upgrade is her element burst. Diona’s burst is the only way to heal her teammates, so that skill should be maxed out. You can also focus on her elemental skill to build up her shield strength. You won’t be using her normal attack that often so it is safe to ignore leveling it up.
Diona can support a variety of teams due to her ability to heal and debuff the enemy. She can protect Main DPS characters like Razor and Diluc, while proving cryo reactions.
For her recommended weapon, either the Sacrificial Bow or the Favonius Warbow would work well with Diona because of their energy recharge secondary stat. She wouldn’t benefit from any of the 5-star weapons because of her low DMG output, so it is recommended to use those bows on another character. The Sacrificial Bow has a chance to reduce her elemental skill cooldown after damaging the enemy with her Icy Paws, while the Favonius Warbow can regenerate energy when she deals a Crit Hit. Diona won’t have a high CRIT Rate, so the Sacrificial Bow is less situational to use.
The Stringless can also work if you want to boost the damage of Diona’s elemental skill & burst. It will also increase the damage of her reactions.
In the early game, Recurve Bow is a great weapon to use. This weapon will boost her HP and will restore some HP after defeating an enemy. This weapon would also work in the late game if you don’t have another bow for her.
To increase her healing effectiveness, the Maiden’s Beloved is Diona’s best artifact set for this build. Both the set bonus will increase Diona’s healing potential. You should focus mainly on Energy Recharge on her artifacts so you can use her burst more often. Diona’s burst is the only way to heal, so that is your number one priority. You can also focus on her HP to boost the amount of health her burst restores. Healing Bonus% is another good option as well.
This build works similar to Diona’s healer build, but focuses more on her support potential. Diona can provide support for your DPS units while providing cryo reactions for melt and superconduct. Like the other build, she can support a variety of teammates. Focus on maxing both her elemental skill and burst to boost her versatility in your team. Her shield can absorb damage, while her burst will heal the team. The team from her other build can be used interchangeably with this build. Her normal attack talent isn’t really needed because she won’t be your main attacker.
Her recommended weapon is either the Sacrificial Bow or The Stringless, depending on your preference. The Sacrificial Bow is great to recharge her burst faster while The Stringless will deal more DMG with her reactions. The Favonius Warbow can also be used like in the previous build for its energy recharge stat.
Diona’s artifact set for this build should be the Noblesse Oblige. This artifact set will boost the power of her elemental burst while increasing the ATK% of a character when she switches to them. The main stats you need to focus on are like the previous build; Energy Recharge, HP, and, Healing Bonus.